flex tree铺展

flex tree展开
Flex的Tree组件自动展开的代码
function init()
{
   tree.dataProvider=dataList;
   tree.callLater(expendTree);
}
private function expendTree():void
{
   tree.expandItem(dataList.node[0],true,false);
   tree.expandItem(dataList.node[1],true,false);
}